JPH0223486B2 - - Google Patents
Info
- Publication number
- JPH0223486B2 JPH0223486B2 JP59250427A JP25042784A JPH0223486B2 JP H0223486 B2 JPH0223486 B2 JP H0223486B2 JP 59250427 A JP59250427 A JP 59250427A JP 25042784 A JP25042784 A JP 25042784A JP H0223486 B2 JPH0223486 B2 JP H0223486B2
- Authority
- JP
- Japan
- Prior art keywords
- glass
- poise
- punching
- viscosity
- rod
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
- 239000011521 glass Substances 0.000 claims description 61
- 238000004080 punching Methods 0.000 claims description 39
- 238000000034 method Methods 0.000 claims description 24
- 239000000463 material Substances 0.000 claims description 4
- 238000000465 moulding Methods 0.000 description 16
- 238000003825 pressing Methods 0.000 description 8
- 238000005498 polishing Methods 0.000 description 5
- 230000009477 glass transition Effects 0.000 description 4
- 230000003287 optical effect Effects 0.000 description 4
- 238000001816 cooling Methods 0.000 description 3
- UONOETXJSWQNOL-UHFFFAOYSA-N tungsten carbide Chemical compound [W+]#[C-] UONOETXJSWQNOL-UHFFFAOYSA-N 0.000 description 3
- 239000012467 final product Substances 0.000 description 2
- 239000012530 fluid Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 239000005304 optical glass Substances 0.000 description 2
- 230000003647 oxidation Effects 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- 230000001590 oxidative effect Effects 0.000 description 2
- 238000005482 strain hardening Methods 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- 239000000919 ceramic Substances 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 230000004927 fusion Effects 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 239000006060 molten glass Substances 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 239000000047 product Substances 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B29/00—Reheating glass products for softening or fusing their surfaces; Fire-polishing; Fusing of margins
- C03B29/04—Reheating glass products for softening or fusing their surfaces; Fire-polishing; Fusing of margins in a continuous way
- C03B29/14—Reheating glass products for softening or fusing their surfaces; Fire-polishing; Fusing of margins in a continuous way with vertical displacement of the products
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B11/00—Pressing molten glass or performed glass reheated to equivalent low viscosity without blowing
- C03B11/06—Construction of plunger or mould
- C03B11/08—Construction of plunger or mould for making solid articles, e.g. lenses
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B21/00—Severing glass sheets, tubes or rods while still plastic
- C03B21/04—Severing glass sheets, tubes or rods while still plastic by punching out
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B2215/00—Press-moulding glass
- C03B2215/70—Horizontal or inclined press axis
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B2215/00—Press-moulding glass
- C03B2215/76—Pressing whereby some glass overflows unrestrained beyond the press mould in a direction perpendicular to the press axis
- C03B2215/77—Pressing whereby some glass overflows unrestrained beyond the press mould in a direction perpendicular to the press axis with means to trim off excess material
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Manufacturing & Machinery (AREA)
- Manufacturing Of Magnetic Record Carriers (AREA)
- Surface Treatment Of Glass (AREA)
Description
【発明の詳細な説明】
［産業上の利用分野］
本発明は寸法精度の高いガラス成形体を得るよ
うにした打ち抜き成形方法に関する。特に、プレ
ス成形後において研削、研磨を必要としないプレ
スレンズ或いはそのプリフオームとして利用する
ことを特徴とするものである。DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a punching method for obtaining a glass molded body with high dimensional accuracy. In particular, it is characterized in that it can be used as a press lens or its preform that does not require grinding or polishing after press molding.
［従来の技術］
最近、プレス成形後において研削、研磨を必要
としない高い形状精度とスムーズな表面を有する
プレスレンズの製造方法に関する研究が盛んに行
われている。米国特許第3833347号、米国特許第
4139677号、米国特許第4168961号明細書等にその
例がみられるが、米国特許第3833347号明細書等
に示されている成形方法は特殊な型材料を用い、
その表面を光学鏡面とし、非酸化性雰囲気にし
て、ガラスと共に型の温度をガラスの軟化点
（107.65ポアズの粘度に相当する温度）近傍まで上
昇させ、その温度で１〜５分間保持し、型に荷重
をかけてプレスし、荷重を維持したまま型温度を
ガラス転移温度よりも低い温度まで下げるという
ものである。[Prior Art] Recently, research has been actively conducted on methods of manufacturing press lenses that do not require grinding or polishing after press molding and have high shape accuracy and smooth surfaces. U.S. Patent No. 3833347, U.S. Patent No.
Examples of this can be found in US Pat. No. 4,139,677 and US Pat. No. 4,168,961, but the molding method shown in US Pat. No. 3,833,347 uses a special mold material,
The surface is made into an optical mirror surface, the temperature of the mold together with the glass is raised to near the softening point of the glass (temperature corresponding to the viscosity of 10 7.65 poise) in a non-oxidizing atmosphere, and the temperature is maintained at that temperature for 1 to 5 minutes. The process involves applying a load to the mold, pressing it, and lowering the mold temperature to a temperature lower than the glass transition temperature while maintaining the load.
この方法では成形のサイクルタイムが著るしく
長くなるが、最近、成形のサイクルタイムを短縮
させた成形方法が開示されている。特開昭58−
84134号公報には最終製品に近似した形状のガラ
スプリフオームを使用し、このガラスプリフオー
ム及び型を約108ポアズ以上で且つ1012ポアズ以
下のガラス粘度に対応する温度まで加熱してか
ら、荷重をかけてプレスし、次いで1013ポアズよ
りも低いガラス粘度に対応する温度まで降温し、
しかる後に荷重を解除してガラス形成品を型から
取り出すという成形方法が示されている。又、特
願昭59−140548号には、型内にガラスプリフオー
ムを挿入し、ガラスプリフオームの粘度が108.5〜
1010.5ポアズに相当する温度で上型とは分離した
押棒により荷重をかけて数秒ないし数10秒間プレ
スし、次いで押棒を後退させて荷重を解除し、ガ
ラス成形体を押型に包んだままガラス粘度が
1011.5ポアズ以上になるまで冷却することを特徴
とするプレスレンズの製造方法が示されている。 Although this method significantly lengthens the molding cycle time, recently a molding method has been disclosed which shortens the molding cycle time. Japanese Unexamined Patent Publication 1983-
Publication No. 84134 uses a glass preform with a shape similar to the final product, heats the glass preform and mold to a temperature corresponding to a glass viscosity of about 10 8 poise or more and 10 12 poise or less, and then Pressing under load, then cooling to a temperature corresponding to a glass viscosity lower than 10 13 poise,
A molding method is disclosed in which the load is then released and the glass formed article is removed from the mold. Furthermore, in Japanese Patent Application No. 140548/1983, a glass preform is inserted into a mold, and the viscosity of the glass preform is 10 8.5 ~
10 At a temperature equivalent to 10.5 poise, press with a push rod separate from the upper mold for several seconds to several tens of seconds, then move the push rod back to release the load, and keep the glass molded object wrapped in the mold until the glass viscosity increases. but
A method for manufacturing a press lens is disclosed, which is characterized by cooling the lens to 10 to 11.5 poise or more.
［発明が解決しようとする問題点］
上記のように成形サイクルタイムを短縮するも
のとして提案された前記特開昭58−84134号及び
特願昭59−140548号の発明に共通する特徴は、比
較的高粘性でプレスを行つていることであり、高
粘性の場合ガラスをのばして変形させる量が小さ
くなるから最終形状に近似した形状のプリフオー
ムを用いている点である。最終形状に近似した形
状のプリフオームを得る従来技術としては、第１
に球面に研削、研磨する方法がある。非球面レン
ズにプレス成形する場合はこの方法は有効である
と考えられるが、球面レンズにプレス成形する場
合はその意味がほとんどなくなると云える。又、
非球面にプレス成形する場合においても冷間加工
の長い工程を行わねばならない研削、研磨の方法
は必ずしも好ましい方法とは云い難い。第２には
従来のおおよその形状を作るプレス技術が考えら
れる。即ち、溶融ガラスを流出口より10〜103ポ
アズの粘性で落下させて切断し、これをガラス転
移点より低温の金型で受けて、２〜10Kg／cm2の圧
力でプレス成形する方法である。しかしながら、
この方法ではシヤーマークと呼ばれる小泡が入
り、又大きなヒケが起こり、容量や寸法の変動も
一般に大きいため、プレスレンズ用のプリフオー
ムとしては適当ではない。[Problems to be Solved by the Invention] As mentioned above, the common features of the inventions of Japanese Patent Application Laid-open No. 58-84134 and Japanese Patent Application No. 140548-1987, which were proposed to shorten the molding cycle time, are The reason is that pressing is performed with a high viscosity, and when the viscosity is high, the amount by which the glass is stretched and deformed is small, so a preform with a shape close to the final shape is used. As a conventional technique for obtaining a preform with a shape close to the final shape, the first method is
There is a method of grinding and polishing into a spherical surface. Although this method is considered effective when press-molding an aspherical lens, it has little meaning when press-molding a spherical lens. or,
Even in the case of press forming into an aspherical surface, grinding and polishing methods that require a long process of cold working are not necessarily preferred methods. A second option is a conventional press technique that creates an approximate shape. That is, the molten glass is cut by falling from the outlet at a viscosity of 10 to 103 poise, received in a mold at a temperature lower than the glass transition point, and press-formed at a pressure of 2 to 10 kg/cm2. be. however,
This method causes small bubbles called shear marks, large sink marks, and generally large variations in capacity and dimensions, so it is not suitable as a preform for press lenses.
［発明の目的］
本発明の目的はプレスレンズ用の寸法精度の高
いプリフオーム又はレンズを冷間加工を行わず
に、経済的に作ることにある。プレスレンズ用の
プリフオームとしては、最終製品の形状に近けれ
ば近いほど有利であり、本発明はガラスシート或
いはロツドの高精度成形技術が今日、相当進展し
ていることに着目し、これを金属の冷間打ち抜き
と同様に熱間で高精度に打ち抜き成形することを
特徴とするものである。[Object of the Invention] An object of the present invention is to economically produce a preform or lens with high dimensional accuracy for a press lens without performing cold working. As a preform for a press lens, the closer it is to the shape of the final product, the more advantageous it is.The present invention focuses on the fact that high-precision molding technology for glass sheets or rods has advanced considerably today, and applies this to metal molding. It is characterized by hot punching and forming with high precision, similar to cold punching.
［問題点を解決するための手段］
上記目的を達成するため、本発明は流動性を有
するガラスを打ち抜き型で打ち抜いてガラス成形
体を得るようにしたものである。[Means for Solving the Problems] In order to achieve the above object, the present invention is such that a glass molded body is obtained by punching fluid glass with a punching die.
すなわち、本発明は、上部の予備加熱炉から流
動性を有するシート状またはロツド状ガラスを垂
下し、垂下したシート状またはロツド状ガラス
を、対向面の一方に突起を有する１対のダイと、
両ダイの内部にそれぞれ相対移動可能に挿設した
左右のパンチとからなる打ち抜き型内に供給し、
ダイの移動によりシート状またはロツド状ガラス
の打ち抜き部外周縁を前記突起でおさえたのち、
ダイ内部のパンチを作動して打ち抜くと同時に成
形することを特徴とするものである。 That is, in the present invention, a sheet-shaped or rod-shaped glass having fluidity is suspended from an upper preheating furnace, and the hanging sheet-shaped or rod-shaped glass is connected to a pair of dies having protrusions on one of the opposing surfaces.
It is fed into a punching die consisting of left and right punches that are inserted into the inside of both dies so that they can move relative to each other.
After pressing the outer periphery of the punched part of the sheet-like or rod-like glass with the protrusion by moving the die,
The feature is that the punch inside the die is operated to perform punching and forming at the same time.
本発明によれば、上部の予備加熱炉から垂下し
たシート状またはロツド状ガラスを打ち抜く直前
に、ダイ端面の突起で押さえて逃げを止めたの
ち、ダイ内部のパンチを作動させるので、型内に
打ち抜きくずを残さずに正確に打ち抜くことがで
きる。 According to the present invention, immediately before punching the sheet or rod-shaped glass hanging down from the upper preheating furnace, the punch inside the die is activated after pressing it with the protrusion on the end face of the die to prevent it from escaping. It is possible to punch out accurately without leaving any punching waste.
金属では冷間打ち抜き成形が盛んに行われてい
るが、ガラスは脆性破壊する材料であるため、冷
間での打ち抜き型による打ち抜きはできない。本
発明はガラスをガラス転移温度以上に上げると粘
性流動を起こすようになり、打ち抜き型による打
ち抜き成形ができることを見い出して成つたもの
である。即ち、本発明は流動性を有するガラスを
打ち抜き型で打ち抜くことを特徴としており、よ
り好ましくは108乃至1012.5ポアズの粘度を有する
ガラスを108.5乃至1013ポアズのガラス粘度に対応
する温度の打ち抜き型で打ち抜いて寸法精度の高
いガラス成形体を得るものである。 Cold punching is widely used for metals, but glass is a material that is brittle and fractures, so it cannot be punched using cold punching dies. The present invention was made based on the discovery that when glass is raised to a temperature higher than its glass transition temperature, viscous flow occurs and the glass can be punched and formed using a punching die. That is, the present invention is characterized by punching fluid glass with a punching die, and more preferably punches glass having a viscosity of 10 8 to 10 12.5 poise at a temperature corresponding to a glass viscosity of 10 8.5 to 10 13 poise. A glass molded body with high dimensional accuracy is obtained by punching with a punching die.
型温度はガラス温度と等しくてもよいし、若干
低くてもよい。高精度に、かつ付着物なく成形さ
れたシート或いはロツドをレンズ形状に打ち抜く
ことにより、プレスレンズ用プリフオームとして
の効果が発揮される。この範囲より低粘性の場合
は成形後の変形や収縮が大きくなり、十分な寸法
精度が得られないし、打ち抜きによる容量変動も
比較的大きくなる。又一般にガラスと型の融着が
起こりやすくなる。本発明の範囲においても型の
酸化による肌荒れを防止し、型のライフを長くす
るためには非酸化性雰囲気に保つことが望まし
い。1013ポアズ以上の粘度になると打ち抜きは不
可能である。 The mold temperature may be equal to the glass temperature or may be slightly lower. By punching out a sheet or rod formed into a lens shape with high precision and without any deposits, it is effective as a preform for a press lens. If the viscosity is lower than this range, deformation and shrinkage after molding will be large, sufficient dimensional accuracy will not be obtained, and capacity fluctuations due to punching will be relatively large. Additionally, in general, fusion between the glass and the mold tends to occur. Even within the scope of the present invention, it is desirable to maintain the mold in a non-oxidizing atmosphere in order to prevent the mold from becoming rough due to oxidation and to extend the life of the mold. If the viscosity exceeds 10 13 poise, punching is impossible.
本発明に用いる型は高温強度および高温硬度が
十分にあり、108ポアズ以上の高粘度のガラスと
融着することなく、又顕著な肌荒れも起こさない
ものであればいかなる材料であつてもよい。例え
ば、炭化タングステンや炭化タングステンにセラ
ミツクコーテイングしたもの等が有効である。又
打ち抜き型の打ち抜きのクリアランスが大きいと
バリを生じてしまうため、打ち抜き型及びそのア
センブリーは高精度に作つて、クリアランスを約
10μm以下に押える必要がある。本発明の目的は
上記のように非常に形状精度の高いプレスレンズ
を得るためのプリフオームを作ることであるが、
型を光学鏡面に仕上げておけば本発明の範囲でも
あまり高面精度を要求されない光学レンズは作る
ことができる。又、この際、打ち抜き成形後型と
共にガラスを冷却しガラス粘度が1011.5ポアズ以
上になつてから取り出すことにより面精度を向上
させることができる。 The mold used in the present invention may be made of any material as long as it has sufficient high-temperature strength and high-temperature hardness, does not fuse with glass having a high viscosity of 108 poise or more, and does not cause noticeable roughness. . For example, tungsten carbide or tungsten carbide coated with ceramic is effective. Also, if the clearance of the punching die is large, burrs will occur, so the punching die and its assembly must be made with high precision and the clearance should be approximately
It is necessary to keep it below 10μm. The purpose of the present invention is to create a preform for obtaining a pressed lens with extremely high shape accuracy as described above.
If the mold is finished to an optical mirror surface, an optical lens that does not require very high surface precision can be manufactured within the scope of the present invention. In addition, at this time, the surface precision can be improved by cooling the glass together with the mold after punching and forming, and taking it out after the glass viscosity reaches 1011.5 poise or more.
実施例 １
第１図は本発明方法を実施する成形装置の概略
断面図を示し、第２図ないし第４図に打ち抜き成
形動作の一部拡大図を示す。Embodiment 1 FIG. 1 shows a schematic sectional view of a forming apparatus for carrying out the method of the present invention, and FIGS. 2 to 4 show partially enlarged views of the punching and forming operation.
成形装置は左右の固定板１７，１８と支持板２
４，２５をタイロツド１９，２０で連結し、両固
定板１７，１８に設けたシリンダ７，９のピスト
ンロツドに可動板２１，２２を取付ける。可動板
２１，２２にロツド２３，２３を介して左右の母
型１１，１２を設ける。ロツド２３，２３は支持
板２４，２５に対してスライド自在に支持され、
更に支持板間に設けた型の精度出し用ガイド１
５，１５により、前記母型１１，１２をスライド
自在に支持している。母型１１，１２内には型内
ヒータ１３，１４を有しており、また互いに対向
するダイ５，６を有している。ダイ５，６の内部
には、それぞれ相対移動可能に左右のパンチ３，
４が挿合されている。ダイ５は、図示のように打
ち抜き部周縁に相当するダイ端面に、リング状の
突起５ａを設けている。この突起５ａは、打ち抜
き直前のシート状またはロツド状ガラスを押えて
逃げ止めの役割を果すものである。また前記支持
板２４，２５の中央にシリンダ１０，８を設け、
それらのピストンロツドを母型内に延出させて、
それぞれのダイに対し相対的にスライドできるパ
ンチ３，４を設けている。 The molding device consists of left and right fixing plates 17, 18 and a support plate 2.
4 and 25 are connected by tie rods 19 and 20, and movable plates 21 and 22 are attached to piston rods of cylinders 7 and 9 provided on both fixed plates 17 and 18. Left and right master molds 11 and 12 are provided on movable plates 21 and 22 via rods 23 and 23, respectively. The rods 23, 23 are slidably supported on support plates 24, 25,
Furthermore, a guide 1 for precision of the mold provided between the support plates.
5 and 15 support the mother molds 11 and 12 in a slidable manner. The mother molds 11 and 12 have in-mold heaters 13 and 14, and dies 5 and 6 facing each other. Inside the dies 5 and 6, there are left and right punches 3, which are movable relative to each other.
4 has been inserted. As shown in the figure, the die 5 has a ring-shaped protrusion 5a on the die end surface corresponding to the peripheral edge of the punched part. This protrusion 5a plays the role of holding down the sheet-shaped or rod-shaped glass just before punching to prevent it from escaping. Further, cylinders 10 and 8 are provided at the center of the support plates 24 and 25,
Extending those piston rods into the mother mold,
Punches 3 and 4 are provided that can slide relative to each die.
図示例は重フリント系光学ガラスのSF11（ガラ
ス転移温度435℃）を公知の技術でロツド状に高
精度に押し出し成形し、引き続き炭化タングステ
ンから成る打ち抜き型を用いて直径16mm、中心肉
厚3.5mmの両凸レンズ形状プリフオームを製造す
る場合を示す。 In the illustrated example, heavy flint optical glass SF11 (glass transition temperature 435°C) is extruded into a rod shape with high precision using a known technique, and then a die made of tungsten carbide is used to extrude it into a rod shape with a diameter of 16 mm and a center wall thickness of 3.5 mm. A case is shown in which a biconvex lens-shaped preform is manufactured.
高精度押し出し成形機（図示省略）で押し出さ
れたガラスロツド１は予備加熱炉であるヒータ２
により、ガラス粘度を109ポアズ（490℃）とされ
る。光学鏡面に研磨したパンチ３，４及びダイ
５，６からなる打ち抜き成形型を109ポアズのガ
ラス粘度に対応する490℃に保ち、上記ヒータ２
を経て垂下したガラスロツド１を開き状態の成形
型内に供給する。次いで、シリンダ７と８により
ダイ６とパンチ４を第２図に示すようにロツドの
位置に持ち来たし、シリンダ９によりダイ５で約
400Kgの圧力でロツド１を押さえる。しかる後に
パンチ３をシリンダ１０で前進させることによ
り、第３図のようにパンチ３とダイ６により1600
Kgの圧力で打ち抜き切断を行つた。このとき、パ
ンチ４にはシリンダ８により約160Kgのバツク圧
がかけられている。この動作に連続して、第４図
のようにパンチ４が肩部１６でストツプし、パン
チ３で1600Kg（800Kg／cm2）の圧力でプレスを行
い、両凸レンズ形状のガラス成形体を得た。な
お、本動作を通じて、型の隙間よりN2ガスを流
入させ、型の酸化による肌荒れを防止した。得ら
れたガラス成形体は外径精度で±5μm、中心肉厚
で±20μmの繰り返し精度があり、プレスレンズ
のプリフオームとして用いるに十分にな球面の形
状精度と鏡面の表面性状を有していた。 A glass rod 1 extruded by a high-precision extrusion molding machine (not shown) is heated by a heater 2 which is a preheating furnace.
Accordingly, the viscosity of the glass is 10 9 poise (490℃). A punching mold consisting of punches 3 and 4 polished to an optical mirror surface and dies 5 and 6 was maintained at 490°C, which corresponds to the glass viscosity of 109 poise, and the heater 2
The hanging glass rod 1 is fed into an open mold. Next, the die 6 and punch 4 were brought to the rod position as shown in FIG.
Press Rod 1 with 400Kg of pressure. After that, by advancing the punch 3 with the cylinder 10, the punch 3 and the die 6 form a 1600 mm
Punching and cutting was performed with a pressure of Kg. At this time, a back pressure of approximately 160 kg is applied to the punch 4 by the cylinder 8. Continuing with this operation, the punch 4 stopped at the shoulder 16 as shown in Figure 4, and pressing was performed with the punch 3 at a pressure of 1600 kg (800 kg/cm 2 ) to obtain a glass molded object in the shape of a biconvex lens. . In addition, through this operation, N 2 gas was allowed to flow in through the gaps in the mold to prevent the surface from becoming rough due to oxidation of the mold. The obtained glass molded body had an outer diameter accuracy of ±5 μm and a center thickness repeatability of ±20 μm, and had sufficient spherical shape accuracy and mirror surface texture to be used as a press lens preform. .
実施例 ２
ロツド成形法と類似の技術で実施例１と同様に
重フリント系光学ガラスのSF11をシート状に引
き下げ成形し、ヒータ２により、シートの粘度を
108.5ポアズ（507℃）にし、109.5ポアズのガラス
粘度に対応する478℃になつた打ち抜き成形型で、
実施例１と同様の手順で打ち抜きを行い、連続し
て400Kg／cm2の圧力でプレスを行うことにより、
直径10mm、中心肉厚２mmの両凹レンズ形状のプレ
スレンズ用プリフオームを得た。Example 2 Heavy flint optical glass SF11 was pulled down into a sheet in the same manner as in Example 1 using a technique similar to the rod molding method, and the viscosity of the sheet was reduced using heater 2.
10 to 8.5 poise (507℃), and a punching mold heated to 478℃ corresponding to the glass viscosity of 10 to 9.5 poise.
By punching in the same procedure as in Example 1 and continuously pressing at a pressure of 400 Kg/cm 2 ,
A preform for a press lens in the shape of a biconcave lens with a diameter of 10 mm and a center wall thickness of 2 mm was obtained.
［発明の効果］
本発明によれば、上部の予備加熱炉から垂下し
たシート状またはロツド状ガラスを打ち抜く直前
に、ダイ端面の突起で押さえて逃げを止めたの
ち、ダイ内部のパンチを作動させるので、型内に
打ち抜きくずを残さずに正確に打ち抜くことがで
き、したがつてプレス成形後において、研削、研
磨不要の高精度のプレスレンズを得るための寸法
精度の高いプリフオームを冷間加工を一切行わず
に短時間にかつ経済的に製造できる。又、面精度
のあまりうるさくないレンズに対しては本発明で
製造したものが、最終製品としても使用すること
が可能である。さらには、２平面のガラスフイル
ター等の場合においてはシートを打ち抜くことに
よつて高い外径精度が得られるため冷間でのくり
抜きや丸め加工をする必要がなくなる。[Effects of the Invention] According to the present invention, immediately before punching the sheet or rod-shaped glass hanging down from the upper preheating furnace, the punch inside the die is activated after pressing it with the protrusion on the end face of the die to stop it from escaping. Therefore, it is possible to punch out accurately without leaving any punching waste in the mold, and therefore, after press molding, cold processing is performed to obtain a high-precision press lens that does not require grinding or polishing. It can be manufactured in a short time and economically without any additional steps. Further, for lenses whose surface precision is not too critical, the ones manufactured by the present invention can be used as final products. Furthermore, in the case of a two-plane glass filter, etc., high accuracy in outer diameter can be obtained by punching the sheet, so there is no need for cold punching or rounding.
第１図は本発明に係わるガラスの打ち抜き成形
装置の概略断面図であり、第２図ないし第４図は
打ち抜き成形時の様子を示す拡大断面図である。
１…ガラスロツド、２…ヒータ、３，４…パン
チ、５，６…ダイ、７〜１０…シリンダ、１１，
１２…母型、１３，１４…型ヒータ、１５…ガイ
ド。
FIG. 1 is a schematic sectional view of a glass punching and forming apparatus according to the present invention, and FIGS. 2 to 4 are enlarged sectional views showing the state during punching and forming. 1...Glass rod, 2...Heater, 3, 4...Punch, 5, 6...Die, 7-10...Cylinder, 11,
12... Mother mold, 13, 14... Mold heater, 15... Guide.
Claims (1)
状またはロツド状ガラスを垂下し、 垂下したシート状またはロツド状ガラスを、対
向する端面の一方に突起を有する１対のダイと、
両ダイの内部にそれぞれ相対移動可能に挿設した
左右のパンチとからなる打ち抜き型内に供給し、 少なくとも一方のダイの移動によりシート状ま
たはロツド状ガラスの打ち抜き部外周縁を前記突
起でおさえたのち、ダイ内部のパンチを作動する
ことにより突起をおさえた部分を残してダイの内
部で囲まれたガラスのみを打ち抜くと同時に成形
することを特徴とするガラス成形体を得る方法。 ２ 108〜1012.5ポアズの粘度を有するシート状ま
たはロツド状ガラスを108.5〜1013ポアズのガラス
粘度に対応する温度の打ち抜き型で打ち抜いて寸
法精度の高いガラス成形体とする特許請求の範囲
第１項記載のガラス成形体を得る方法。 ３ 108〜1012.5ポアズの粘度を有するロツド状ま
たはシート状のガラスを108.5〜1013ポアズのガラ
ス粘度に対応する温度のガラスと接する面を鏡面
とした打ち抜き型で打ち抜いて寸法精度の高いレ
ンズ又はレンズに近い形状のガラス成形体とする
特許請求の範囲第２項記載のガラス成形体を得る
方法。 ４ 1011.5ポアズ以上のガラス粘度で、ガラス成
形体を打ち抜き型より取り出すことを特徴とする
特許請求の範囲第３項記載のガラス成形体を得る
方法。[Claims] 1. A sheet or rod-shaped glass having fluidity is suspended from an upper preheating furnace, and the suspended sheet-shaped or rod-shaped glass is connected to a pair of dies having protrusions on one of the opposing end surfaces. and,
The material is fed into a punching die consisting of left and right punches that are inserted into the interiors of both dies so that they can move relative to each other, and by moving at least one of the dies, the outer periphery of the punched part of the sheet or rod glass is held down by the protrusion. Thereafter, by operating a punch inside the die, only the glass surrounded by the inside of the die is punched out, leaving the part where the protrusions are suppressed, and simultaneously formed. The scope of the patent claims that a sheet or rod-like glass having a viscosity of 2108 to 1012.5 poise is punched with a punching die at a temperature corresponding to the glass viscosity of 108.5 to 1013 poise to produce a glass molded body with high dimensional accuracy. A method for obtaining a glass molded article according to item 1. 3. High dimensional accuracy is achieved by punching rod-shaped or sheet-shaped glass with a viscosity of 10 8 to 10 12.5 poise using a punching die with a mirror finish on the surface that contacts the glass at a temperature corresponding to the glass viscosity of 10 8.5 to 10 13 poise. A method for obtaining a glass molded article according to claim 2, wherein the glass molded article is a lens or a glass molded article having a shape similar to a lens. 4. A method for obtaining a glass molded body according to claim 3, characterized in that the glass molded body is taken out from the punching die at a glass viscosity of 4 10 11.5 poise or more.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP25042784A JPS61132523A (en) | 1984-11-29 | 1984-11-29 | Process for producing molded glass |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP25042784A JPS61132523A (en) | 1984-11-29 | 1984-11-29 | Process for producing molded glass |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS61132523A JPS61132523A (en) | 1986-06-20 |
| JPH0223486B2 true JPH0223486B2 (en) | 1990-05-24 |
Family
ID=17207721
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP25042784A Granted JPS61132523A (en) | 1984-11-29 | 1984-11-29 | Process for producing molded glass |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS61132523A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0723227B2 (en) * | 1988-02-19 | 1995-03-15 | キヤノン株式会社 | Optical element molding equipment |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5456622A (en) * | 1977-10-12 | 1979-05-07 | Stanley Electric Co Ltd | Method of molding linghting application lens |
| JPS5884134A (en) * | 1981-10-30 | 1983-05-20 | コ−ニング グラス ワ−クス | Formation of precision glass product |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4936137U (en) * | 1972-06-26 | 1974-03-30 |
-
1984
- 1984-11-29 JP JP25042784A patent/JPS61132523A/en active Granted
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5456622A (en) * | 1977-10-12 | 1979-05-07 | Stanley Electric Co Ltd | Method of molding linghting application lens |
| JPS5884134A (en) * | 1981-10-30 | 1983-05-20 | コ−ニング グラス ワ−クス | Formation of precision glass product |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS61132523A (en) | 1986-06-20 |
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